javascript - 将对象数组过滤为对象

Question

如何将以下这些输入转换为输出。

输入:

[{"id":1, "subid":5}, 
{"id":1, "subid":9}, 
{"id":2, "subid":16}, 
{"id":2, "subid":27}]

输出:

[{1:[5,9]},
{2:[16,27]}]

这是我目前尝试过的:

var newobj = new Object(); 
listOfObject.forEach(function(i) { 
   var id = i.id 
   newobj[id] = [] 
   newobj[id].push(i.subid) 
   return newobj 
})

Answer 1

像这样减少数据:

var arrayData = [{"id":1, "subid":5}, {"id":1, "subid":9}, {"id":2, "subid":16}, {"id":2, "subid":27}];

var result = arrayData.reduce(function (result, obj) {
  var id = obj.id;
  result[id] = (result[id] || []);
  result[id].push(obj.subid);
  return result;
}, {});